diff --git a/buildout.cfg b/buildout.cfg
index 256c928..0b66ca6 100644
--- a/buildout.cfg
+++ b/buildout.cfg
@@ -16,5 +16,5 @@ eggs = zest.pocompile
 
 [versions]
 plone.app.discussion =
-zope.interface = 3.6.1
+zope.interface = 4.0.5